package demo;

public class Computer {
    public void poweron(){
        System.out.println("打开电脑");
    }
    public void poweroff(){
        System.out.println("关闭电脑");
    }
    public void UseDevice(USB usb){
        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse=(Mouse) usb;
            mouse.click();
        }
        if(usb instanceof KeyBoard){
            KeyBoard keyBoard=(KeyBoard) usb;
            keyBoard.input();
        }
    }
}
